[PVE-User] systemd-logind.service (Piviul)

[Kalpesh Sejpal]

Hi Piviul,

Using it with unprivileged containers it doesn't have any security risks.

AppArmor profile for nesting flag is

# /etc/apparmor.d/lxc/lxc-default-cgns-with-nesting
profile lxc-container-default-cgns flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/lxc/container-base>
  #include <abstractions/lxc/start-container>

  deny /dev/.lxc/proc/** rw,
  deny /dev/.lxc/sys/** rw,
  mount fstype=cgroup -> /sys/fs/cgroup/**,
  mount fstype=proc -> /var/cache/lxc/**,
  mount fstype=sysfs -> /var/cache/lxc/**,
  mount options=(rw,bind),
}

But with privileged contains with nesting Flag can modify sys/** and
proc/** of other containers, which can be disastrous.

Regards,
Kalpesh Sejpal

On Fri, 9 Sep, 2022, 3:30 pm , <pve-user-request at lists.proxmox.com> wrote:

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>    1. Re: systemd-logind.service (Piviul)
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> Message: 1
> Date: Thu, 8 Sep 2022 11:58:51 +0200
> From: Piviul <piviul at riminilug.it>
> To: pve-user at lists.proxmox.com
> Subject: Re: [PVE-User] systemd-logind.service
> Message-ID: <b520b36f-a052-4356-285e-334bc3945a71 at riminilug.it>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 05/09/22 12:27, Kalpesh Sejpal wrote:
> > Hi,
> >
> > It's better to enable features Flag nesting=1 for each LXC container with
> > that error.
> >
> > Please, check security conserns before changing it.
> >
> > If you can't do that then another alternative it to mask systemd-logind
> > service.
>
> Hi Kalpesh, thank you very much. In effect both solution seems to work.
> There are security risk to set nesting flag on unprivileged container?
>
> Piviul
>
>
>
>
>
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